Shelf Life and Preservation for Natural Lip Scrub

Regarding the natural lip scrub made with sugar, honey, coconut oil, and food coloring:

• Shelf Life Without Preservatives: Because this formula contains honey, which is a water-based ingredient, it is highly susceptible to microbial growth (bacteria, mold, yeast). Without a preservative, the shelf life will be very short, likely only a few days to a week. Using the scrub after it has spoiled could potentially cause irritation or infection.

• Necessity of Preservative: To ensure safety and significantly extend the shelf life of your lip scrub, it is strongly recommended to include a broad-spectrum preservative.

• Using Mild Preserved Eco™: Mild Preserved Eco™ is a suitable option for preserving cosmetic formulas. According to the product information:

  • Usage Rate: The recommended usage rate for general cosmetic formulas is 1.0-1.5%. For formulas that are more challenging to preserve (e.g., containing many natural ingredients), up to 2.0% may be used.
  • Mixing: It can be added in the last step of your formula. It can be dispersed in oil or dissolved in water with blending. You do not necessarily need a separate coupling agent specifically for adding this preservative, but thorough blending is important to ensure it is evenly distributed throughout your scrub, especially given the mix of oil and honey.
  • pH Range: It works effectively in formulas with a pH range of 4-9, which is suitable for most lip scrub formulations.

• Amount for a 5g Batch: Based on the recommended usage rate of 1.0-1.5%:

  • For 1.0% usage: 5g * 0.01 = 0.05g
  • For 1.5% usage: 5g * 0.015 = 0.075g

You would typically add between 0.05g and 0.075g of Mild Preserved Eco™ to a 5g batch of your lip scrub.

For commercial production, it is always recommended to perform challenge testing to confirm the effectiveness of the preservative in your specific formula.